Ellise, of French origin, means 'God is my oath'. It's a variant spelling of the name Éliette, which itself stems from Élisabel, the French form of Elizabeth. Ellise is often associated with elegance and sophistication, carrying an air of timelessness.
"Ellise peaked in popularity between the late 1980s to mid-1990s with a significant rise from 8 births in 1988 to 29 births in 2002, but has since seen a decline."